<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<div id="app">
  <h2>{{firstName + ''+ lastName}}</h2>
  <h2>{{getFullName()}}</h2>
  <h2>{{fullName}}</h2>
</div>
<script src="../vue.js"></script>
<script>
  const app = new Vue({
    el: '#app',
    data: {
      firstName:'leBron',
      lastName:'James'
    },
    computed:{
      fullName:function () {
        return this.firstName +'' +this.lastName
      }
    },
    methods:{
      getFullName(){
        return this.firstName + this.lastName
      }
    }
  })
</script>
</body>
</html>
